Question

Half-life of a radioactive material is 693 yr. Calculate the value of decay constant of material

Answer 1

We know, radioactive decay are first order reactions

$\Rightarrow t_{1/2}=\frac{0.693}{K}$

$\Rightarrow 693=\frac{0.693}{K}$

$K=\frac{0.693}{693\times 365\times 24\times 60\times 60}$

$K=3.1709\times {10}^{-11}{s}^{-1}$.